LL6.0 installs but after update get X.509 error @boot; LL6.6 install screws PC

[Alan_Wilts]

Lenovo V15 ADA laptop with NMVe SSD and Windows 11 Home PC. Secure boot is off.

I shrunk the Win11 and then installed LL 6.0 no updates with /, /home & data partitions all ext4.
Booted OK into Windows and LL 6.0 via Grub.

Then I changed the data partition to NTFS, changed the desktop appearance and icon style and did a system update.
Then as requested I rebooted but it failed to boot with:

Code:

[ 0.998701 ] Integrity Problem loading X.509 certificate -65Your are in emergency mode. After logging in type "journalctl -xb" to view system logs.
"journalctl -reboot" to reboot. "journalctl -default" or "exit" to boot into default mode.
Press Enter for maintenance (or press Control-D to continue)

I pressed control-D and get:

Code:

Failed to start default target: Transaction for graphical.target/start is destructive (emergency/target has 'start' job queued, but 'stop' is included in transaction).

Forced a reboot and checked BIOS. All seems OK. Rebooted but get the X.509 error followed by 100s of errors re USB device descriptor errors. Had to power on & off.

Downloaded LL 6.6 to USB stick and booted Live to Desktop and clicked Install. After selecting the previous / and ./home partitions and clicking format the installation fails with:

Code:

GNU GRUB Version 2.06 error: Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions.Anywhere else TAB lists possible device or file completions.
grub>

So now I have a PC that does not boot into either LL or Windows   Luckily I do have an image of the whole system with just Windows but don't want to go down that route until I have a solution.Suggestions please.Alan
PS been using LL for many years on an older laptop without problem and have recently installed LL6.6 onto a old desktop with SSD and Clover and that is working. But neither is dual boot with Windows and neither has secure boot.





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